National Tariff Line
National Tariff Line codes refer to the classification codes, applied to merchandise goods by individual countries, that are longer than the HS six-digit level. Countries are free to introduce national distinctions for tariffs and many other purposes. The national tariff line codes are based on the HS system but are longer than six digits. For example, the six-digit HS code 010120 refers to Asses, mules, and hinnies, live, whereas the US National Tariff line code 010120.10 refers to live purebred breeding asses, 010120.20 refers to live asses other than purebred breeding asses and 010120.30 refers to mules and hinnies imported for immediate slaughter.